Two stones are thrown into air with speeds 20 m/s, 40m/s respectively? What are accelerations possessed by the objects?

A stone is thrown in a vertically upward direction with a velocity of 5m/s. If the acceleration of the stone during its motion is 10 m//s^(2) in the downward direction, what will be the height attained by the stone and how much time will it take to reach there?

Two bullets A and B of masses 10 gm and 20 gm moving with velocities 20m/s and 10 m/s respectively, strike a mud wall. Which one of the bullets will pierce more?

A ball is dropped from tower of height 45 m. At the same moment another ball is thrown up with a speed of 40 ms from base. What is the relative speed of the balls as a function of time?

A stone tied to one end of a string of radius 0.6m is whirled in a horizontal circle with an angular speed of 120rpm. Calculate the radial acceleration and force exerted by the stone of mass 0.010 kg on the agent.

A hiker stands on the edge of cliff 490 m above the ground and throws a stone horizontally with an initial speed of 15 " m s "^(-1) Neglecting air resistance , find the time taken by the stone to reach the ground , and the speed with which it hits the ground . (Take g=9.8 " m s"^(2)) .